package com.yu.designpatterns.singleton;

/**
 * 懒汉式
 * 虽然达到了按需初始化，但是带来了线程不安全
 */
public class Mgr03 {

    private static Mgr03 INSTANCE;

    private Mgr03(){}

    public static Mgr03 getInstance(){
        if (INSTANCE == null){
            try {
                Thread.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            INSTANCE = new Mgr03();
        }
        return INSTANCE;
    }

    public static void main(String[] args) {
        for (int i = 0; i < 100; i++) {
            new Thread(() -> {
                System.out.println(Mgr03.getInstance().hashCode());
            }).start();
        }
    }

}
